Bug 1302225. Backout skia for unaccelerated windows. r=me

modules/libpref/init/all.js

@@ -760,13 +760,7 @@ pref("gfx.font_rendering.opentype_svg.enabled", true);
 // comma separated list of backends to use in order of preference
 // e.g., pref("gfx.canvas.azure.backends", "direct2d,skia,cairo");
 pref("gfx.canvas.azure.backends", "direct2d1.1,skia,cairo");
-
-#ifdef NIGHTLY_BUILD
-pref("gfx.content.azure.backends", "direct2d1.1,skia,cairo");
-#else
 pref("gfx.content.azure.backends", "direct2d1.1,cairo");
-#endif
-
 #else
 #ifdef XP_MACOSX
 pref("gfx.content.azure.backends", "skia");